Li Xin, Liu Yong-di, Sun Xian-bo, Xu Hong-yong, Qian Fei-yue, Li Xin-jue, Li Mu
College of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2728-34.
The pretreatment of bio-treated effluent of dye wastewater by UV/H2O2 process was studied. The influencing factors, such as H2O2 dosage, reaction time and pH values were evaluated for the removal efficiency of UV254, ADMI7.6, DOC and DOC of dye wastewater by UV/H2O2 process. The experimental results showed that,the optimal conditions determined were as follows: initial pH 7.4-8.1, H2O2 dosage 4.5 mmol x L(-1) and UV irradiation time of 50 min. Under the optimal conditions, UV254, ADMI7.6, DOC and COD removal rate could reach 77%, 94%, 40% and 69%. Removal effects of four different DOM fractions, hydrophobic acids, non-acid hydrophobics, tasnsphilics and hydrophilics separated by XAD-8 and XAD-4 resins. The experimental results show that: hydrophobic material was the main substance causing color, when it was characterized by ADMI7.6, the proportion could reach 92%, of which 53% was non-acid hydrophobics. It indicated that removal efficiencies of tasnsphilics, hydrophobic acids and non-acid hydrophobics were high through UV/H2O2, process, while hydrophilics' efficiencies were lower. The experimental results showed that organic molecules with molecular weight over 10,000 contributed greatly to UV254, ADMI7.6 and DOC removal rate.
研究了采用UV/H2O2工艺对染料废水生物处理出水进行预处理。考察了H2O2投加量、反应时间和pH值等影响因素对UV/H2O2工艺去除染料废水UV254、ADMI7.6、DOC和COD的效率。实验结果表明，确定的最佳条件如下：初始pH为7.4 - 8.1，H2O2投加量为4.5 mmol·L(-1)，UV辐照时间为50 min。在最佳条件下，UV254、ADMI7.6、DOC和COD去除率分别可达77%、94%、40%和69%。采用XAD - 8和XAD - 4树脂分离出四种不同的DOM组分，即疏水酸、非酸性疏水物、亲水性物质和疏水性物质，研究其去除效果。实验结果表明：以ADMI7.6表征时，疏水物质是造成色度的主要物质，其比例可达92%，其中53%为非酸性疏水物。这表明UV/H2O2工艺对亲水性物质、疏水酸和非酸性疏水物的去除效率较高，而对亲水性物质的去除效率较低。实验结果表明，分子量大于10000的有机分子对UV254、ADMI7.6和DOC去除率贡献较大。
